Arista Warrior

Arista Warrior

Gary A. Donahue

Language: English

Pages: 422

ISBN: 1449314538

Format: PDF / Kindle (mobi) / ePub

Though Arista Networks is a relative newcomer in the data center and cloud networking markets, the company has already had considerable success. In this book, renowned consultant and technical author Gary Donahue (Network Warrior) provides an in-depth, objective guide to Arista’s lineup of hardware, and explains why its network switches and Extensible Operating System (EOS) are so effective.

Anyone with a CCNA or equivalent knowledge will benefit from this book, especially entrenched administrators, engineers, or architects tasked with building an Arista network. Is Arista right for your data center? Pick up this guide and find out.

Topic highlights include:

  • SysDB: the EOS system database that holds state, statuses, and variables
  • Multichassis Link Aggregation (MLAG): for linking a port-channel to multiple switches instead of just one
  • Latency Analyzer (LANZ): the interface-buffer troubleshooting tool with a reporting granularity of one millisecond
  • VM Tracer: for adding, changing, and removing VLANs without human interaction
  • Zero-Touch Provisioning (ZTP): for remote switch configuration
  • Hardware advantages: including merchant silicon, low-latency networking, and power consumption
  • Gotchas: issues with Arista switches or systems

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whole affair becomes even more complicated. The process of determining when, and if, traffic may be sent to an interface is called arbitration. Arbitration is usually managed by an ASIC within the switch, and generally cannot be configured by the end user. Still, when shopping for switches, some of the techniques used in arbitration will come up, and understanding them will help you decide what to buy. Now that we understand why input and output buffers exist, let’s take a look at some terms and

Multichassis Link Aggregation (MLAG), is the Arista term for linking a port-channel to multiple switches instead of just one. The technology accomplishes the same basic goal as Cisco’s Virtual Port Channel (vPC); although, in my experience, MLAG is simpler to configure and less likely to fail in colorful, job-threatening ways. MLAG Overview The term LAG is an abbreviation for Link Aggregation, which is a non-Cisco way of describing the bonding of multiple physical links into a single logical

seconds that causes the local router to postpone taking over the active role. The range is from 0 to 3600 seconds (1 hour). The default is 0 second (no delay). reload Specifies the preemption delay, in seconds, after a reload only. This delay period applies only to the first interface-up event after the router has reloaded. In order to set the minimum delay for 30 seconds and the reload delay for 60 seconds, you can combine both into the following single command: SW1(config-if-Vl99)#vrrp

investors, it would seem that Arista is destined for greatness, but the story doesn’t stop there. Ken Duda Ken Duda is a founder, Chief Technology Officer, and Senior Vice President of Software Engineering at Arista. Prior to founding Arastra (now Arista), Ken was CTO of, where he designed a real-time 3-D distributed system that scaled to thou sands of simultaneous users. I have no idea what that means, but it sure sounds cool. Ken was the first employee of Granite Systems, and while Vlan99 Vlan901 If you configure the interfaces with a virtual router address, but don’t configure the global virtual router MAC address, your virtual router won’t work, even though you might think that it should. Here’s what it looks like when starting with no VARP configuration: SW1(config)#int vlan 99 SW1(config-if-Vl99)#ip virtual-router address It looks fine, but the status tells you it’s not. If you’re not used to

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